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tools/dirtpan/: added statistics collection, SIGUSR1 to dump, SIGUSR2 to reset
- dirtpan.c (stats, send_frame, send_more, send_ack, rx_pck, tx_pck, ack_timeout, reass_timeout): gather extensive statistics - dirtpan.c (handle_usr1, main): if running in the foreground, dump statistics on standard error on SIGUSR1 - dirtpan.c (handle_usr2, main): if running in the foreground, reset statistics to zero on SIGUSR2
This commit is contained in:
Werner Almesberger
parent
417d12ce05
commit
0194dc1a05
@ -19,6 +19,7 @@
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#include <string.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <errno.h>
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#include <assert.h>
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#include <sys/types.h>
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#include <sys/time.h>
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@ -64,6 +65,29 @@ enum packet_type {
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#define T_ACK_MS 50
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static struct {
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unsigned tx_pck; /* packets enqueued */
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unsigned lost; /* packets never acked */
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unsigned rx_pck; /* packets successfully received */
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unsigned tx_frm; /* frames sent */
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unsigned rx_frm; /* frames received */
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unsigned tx_frst; /* pt_first sent */
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unsigned rx_frst; /* pt_first received */
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unsigned tx_nxt; /* pt_next sent */
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unsigned rx_nxt; /* pt_next received */
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unsigned tx_ack; /* pt_ack sent */
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unsigned rx_ack; /* pt_ack received */
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unsigned invalid; /* invalid packet type */
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unsigned not_rx; /* pt_next but not receiving */
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unsigned rx_seq; /* wrong rx sequence */
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unsigned not_tx; /* pt_ack but not sending */
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unsigned ack_seq; /* wrong ack sequence */
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unsigned garbled; /* IPv4 length problem */
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unsigned no_ack; /* no ack response (giving up) */
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unsigned retry; /* retransmit */
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unsigned reass; /* reassembly timeout */
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} stats;
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static int tun, net;
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static uint8_t rx_packet[MAX_PACKET], tx_packet[MAX_PACKET+1];
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static void *rx_pos, *tx_pos;
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@ -145,6 +169,35 @@ static void debug_timeout(const char *label)
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}
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/* ----- Statistics -------------------------------------------------------- */
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static void handle_usr1(int sig)
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{
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fprintf(stderr, "\n"
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"tx_pck\t%6u\n" "tx_lost\t%6u\n" "rx_pck\t%6u\n"
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"tx_frm\t%6u\n" "rx_frm\t%6u\n" "tx_frst\t%6u\n"
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"rx_frst\t%6u\n" "tx_nxt\t%6u\n" "rx_nxt\t%6u\n"
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"tx_ack\t%6u\n" "rx_ack\t%6u\n" "invalid\t%6u\n"
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"not_rx\t%6u\n" "rx_seq\t%6u\n" "not_tx\t%6u\n"
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"ack_seq\t%6u\n" "garbled\t%6u\n" "no_ack\t%6u\n"
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"retry\t%6u\n" "reass\t%6u\n",
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stats.tx_pck, stats.lost, stats.rx_pck,
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stats.tx_frm, stats.rx_frm, stats.tx_frst,
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stats.rx_frst, stats.tx_nxt, stats.rx_nxt,
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stats.tx_ack, stats.rx_ack, stats.invalid,
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stats.not_rx, stats.rx_seq, stats.not_tx,
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stats.ack_seq, stats.garbled, stats.no_ack,
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stats.retry, stats.reass);
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}
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static void handle_usr2(int sig)
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{
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memset(&stats, 0, sizeof(stats));
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}
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/* ----- Timers ------------------------------------------------------------ */
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@ -245,6 +298,7 @@ static void send_frame(void *buf, int size)
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{
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debug_dirt("->", buf, size);
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write_buf(net, buf, size);
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stats.tx_frm++;
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}
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@ -252,7 +306,14 @@ static void send_more(void)
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{
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uint8_t *p = tx_pos-1;
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*p = (tx_pos == tx_packet+1 ? pt_first : pt_next) | (tx_seq ? SEQ : 0);
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if (tx_pos == tx_packet+1) {
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*p = pt_first;
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stats.tx_frst++;
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} else {
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*p = pt_next;
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stats.tx_nxt++;
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}
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*p |= tx_seq ? SEQ : 0;
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send_frame(p, send_size()+1);
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start_timer(&t_ack, T_ACK_MS);
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}
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@ -263,6 +324,7 @@ static void send_ack(int seq)
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uint8_t ack = pt_ack | (seq ? SEQ : 0);
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send_frame(&ack, 1);
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stats.tx_ack++;
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}
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@ -276,8 +338,11 @@ static void rx_pck(void *buf, int size)
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debug_dirt("-<", buf, size);
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if (size < 1)
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stats.rx_frm++;
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if (size < 1) {
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stats.invalid++;
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return;
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}
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ctrl = *p;
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type = ctrl & PT_MASK;
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@ -285,6 +350,7 @@ static void rx_pck(void *buf, int size)
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switch (type) {
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case pt_first:
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stats.rx_frst++;
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send_ack(seq);
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if (rxing) {
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stop_timer(&t_reass);
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@ -292,21 +358,32 @@ static void rx_pck(void *buf, int size)
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}
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break;
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case pt_next:
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stats.rx_nxt++;
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send_ack(seq);
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if (!rxing)
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if (!rxing) {
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stats.not_rx++;
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return;
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if (seq == rx_seq)
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}
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if (seq == rx_seq) {
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stats.rx_seq++;
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return; /* retransmission */
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}
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break;
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case pt_ack:
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if (!txing)
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stats.rx_ack++;
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if (!txing) {
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stats.not_tx++;
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return;
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if (seq != tx_seq)
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}
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if (seq != tx_seq) {
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stats.ack_seq++;
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return;
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}
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stop_timer(&t_ack);
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tx_pos += send_size();
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tx_left -= send_size();
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if (!tx_left) {
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stats.lost--;
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txing = 0;
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return;
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}
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@ -315,21 +392,27 @@ static void rx_pck(void *buf, int size)
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send_more();
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return;
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default:
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abort();
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stats.invalid++;
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return;
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}
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if (!rxing) {
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if (size < 5)
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if (size < 5) {
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stats.garbled++;
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return;
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}
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rx_left = p[3] << 8 | p[4];
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if (rx_left > MAX_PACKET)
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if (rx_left > MAX_PACKET) {
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stats.garbled++;
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return;
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}
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start_timer(&t_reass, T_REASS_MS);
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rxing = 1;
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rx_pos = rx_packet;
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}
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if (rx_left < size-1) {
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stats.garbled++;
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stop_timer(&t_reass);
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rxing = 0;
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return;
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@ -344,6 +427,7 @@ static void rx_pck(void *buf, int size)
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write_buf(tun, rx_packet, rx_pos-(void *) rx_packet);
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stop_timer(&t_reass);
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rxing = 0;
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stats.rx_pck++;
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}
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}
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@ -366,6 +450,8 @@ static void tx_pck(void *buf, int size)
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tx_seq = !tx_seq;
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retries = 0;
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send_more();
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stats.tx_pck++;
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stats.lost++;
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}
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@ -374,10 +460,13 @@ static void ack_timeout(void)
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debug_timeout("ACK-TO");
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assert(txing);
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stop_timer(&t_ack);
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if (++retries == MAX_TRIES)
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if (++retries == MAX_TRIES) {
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txing = 0;
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else
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stats.no_ack++;
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} else {
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send_more();
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stats.retry++;
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}
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}
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@ -386,6 +475,7 @@ static void reass_timeout(void)
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debug_timeout("REASS-TO");
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assert(rxing);
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stop_timer(&t_reass);
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stats.reass++;
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rxing = 0;
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}
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@ -413,7 +503,8 @@ static void event(void)
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res = select(net > tun ? net+1 : tun+1, &rset, NULL, NULL,
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timer_delta(to));
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if (res < 0) {
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perror("select");
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if (errno != EINTR)
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perror("select");
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return;
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}
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if (!res) {
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@ -600,9 +691,15 @@ int main(int argc, char **argv)
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net = open_net(pan, src, dst);
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tun = open_tun(cmd);
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if (foreground || !daemonize())
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while (1)
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event();
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return 0;
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if (foreground) {
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signal(SIGUSR1, handle_usr1);
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signal(SIGUSR2, handle_usr2);
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} else {
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if (daemonize())
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return 0;
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}
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while (1)
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event();
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}
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